Electric heat storage heating unit.



M. E. LOUTH & 1. Mcxsou, ELECTRIC HEAT STORAGE HEATING UNIT APPLICATION FILED SEPT-13.1915.

Patented Sept. 4, 1917.

x INVENTORS Z2 Maw/ce 100 Je pa Jackson @42 T 72% nrromsys UNITED STATES B-ATEN T OFFICE.

MAURICE E. LOUTH AND JESSE JACKSON, OFKQKOMO. INDIANA, ASSIGNORS TO THE GLOBE STOVE 8t RANGE GOMPANY,'OF KOKOMO, INDIANA.

ELECTRIC HEAT-STORAGE HEATING UNIT.

Specification of Letters Patent.

Patented Sept. 4, 1917.

Application filed September 13, 1915. Serial No. 50,401.

To all whom it may concern:

Be it known that we, Mnmuon E. LoU'rn and JESSE JACKSON, citizens of the United States, residing at Koko'mo, in the county of Howard and State of Indiana, have invented certain new and useful Improvements in Electric Heat-Storage Heating Units, of which the following is a specification.

The object of this invention is to provide an electric heating unit for electric ovens which has a number of interchangeable subunits which are easily removable 'and replaceable, as for inspection, repair, or the substitution of new parts; and which unit is itself removable and has a considerable heatstorage capacity.

part of each of which there is one of my improved electric heating units, these units being of different size in the two ovens.

Fig. 2 is a plan view of the larger of these heating units.

Fig. 3 is a fragmentary bottom view of the heating unit, showing one of the subunits and its mounting.

Fig. 4 is a section on the line 44 of Fig. 3.

In the drawing, similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Our improredhcating unit comprises a flat metal plate 10, which at its forward edge conveniently has a. down-turned flange 11 provided with a hand hold. and at its rearward edge is provided with a number of projecting split terminal pins 12, so that when the nit is slid into or out of the oven 13 on the ledges 14 on the side walls thereof such projecting split terminal pins 12 will engage with or disengage themselves from unit, of which t1! These suh-units carry the heating conduccorresponding terminal sockets 15 ,in the rear wall of the oven. The terminal-sockets 15 are suitably connected through any control mechanism to an electric supp] circuit. The plate 10 contains :1 considers le mass of metal, so that it serves as a heat storage means for retaining heat in the oven 13 after the heating circuit is opened, so that a. continuance of the cooking after the manner of a fireless cooker may be obtained.

The heater plate-10 is provided with a plurality of holes 20, of which there are shown four on the heating unit in the larger oven and tw onthe heating unit in the,

smaller oven. Around the periphery of each hole 20 preferably extends a strengthening flange 21 from which a number of supporting lugs 22 project a slight distance inward toward the center of the hole. On these lugs 22 rests the top plate 23 of a sube is one for each hole 20.

tors, of which more hereafter, and the upper surfitces of the top lates 23 thereof are preferably flush with t e upper surface of the plate 10. The top plate 23 of each subunit is provided at one point on its periphcry with a downwardly ofi'set and outwardly projectingfinger 24 which extends under the lower edge of the strengthening flangev 21, as is clear from Fig. 4, and at a. pomt directly opposite this finger 24 the top plate 23 is provided with an outwardlyprqecting finger 25 which is in the plane of the top plate and fits into a recess 26 in the edge of the hole 20 and over one of the lugs 22. The

finger 25 and the lug 22 over which it fits are provided with registering :holes for receiving abolt 27 which fastenslthe top plate in place in the hole. Below theltop plate 23 and slightly spaced therefrom is a bottom plate 30, which is smaller than the figtireformed by the inner ends ofthe' lugs 22. This-bottoinfplete 30is attached to the to plate 23 by screws 31, which extend throng such bottom" plete into internally threaded bosses 32 on the under side of the top plate 23. If desired, the bottom plate 30 may be further positioned with respect to the top plate by a series of downwardly projecting lugs 38 on the under side of the top plate 23, which lugs project into notches 34 at various points on the periphery of the bottom plate 30. In the space between the top plate 20 and the bottom plate 30 is located of any desired type insulated in any suitable manner. The terminnls '36 of this heating windin posse throu h insulating bushings 37 in t e t tom p ate 30 and are attached to insulated screws 38 carried by a downwardly pro'ecting flange 39 on the under side of the ttom plate 80. These binding screws 38 are connected by suitable wires 40 to the splitterminal pins 12.0f the heating unit, thisconnection putting the windings'35 of the different un ts in any desired electrical rclatviglrliship wit-me another. h

en an happem to the eating unit, requiri i i g it to be inspected, cleaned, or repaired, or to have another one substituted for it, the whole heating unit maybe withdrawn from the even by sliding it forward on the ledges 14, thereby discunn the terminal plus 12 from the sockets 1 If merely one sub-unit is defective, this subunit may be removed in its entirety from the plate 10 by disconnecting the associated wires 40 from' the binding screws 38 of each sub-unit and removing the sin le bolt 27 which fastens such sub-unit in p ace. Upon the removal of this bolt 27, this sub-unit may be lifted from the hole 20, and repaired at any convenient oint,-if repair is possible, or another sub-unit may be substituted for it. If the defect is merely in the winding 35, the two plates 23 and 30 may be separated by removing the screws 31, whereupon theterminals 36 of the defective winding 35 may be released from the binding screws 38, and another winding substituted for such defective winding, the same plates 23 and 30 being used for the new winding.

40, Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. A heating unit, a metal slide plate having a plur' ity o slip connection terminals at one edge for remov able engagement with cooperating terminals, said slide plate being provided with a hole, a sub-unit mounted in such hole and having a finger WlllOll projects under the ed e of the hole and a second finger which is isplacedfrom the first and projects over the edge of such hole, and means for fastenin said second finger to said plate, said su -unit having a heating winding which is connected to said slip connection terminals.

2. A heating unit, com rising a metal plate, said plate being provided with a hole, a sub-unit mounted in such hole and having a. finger which projects under the edge of the hole and a second finger which is displaced from the first and projects over the edge of such hole, and means for fastening 8. An electric heating unit, comprising 65 a plate provided with a hole and with lugs which project inward from the edge of such hole, and a sub-unit which fits in said hole and rests on said lugs, said sub-unit being provided with one finger which projects under the edge of the hole and another finger which 1s spaced from the first and projects over the 'edge'of such hole, said subunit being provided with aheating winding, and means for fastening one of said fingers to said plate.

4. An electric heating unit, comprising a plate provided with a-hole and with lugs which project inward from the edge of such hole, and a sub-unit which fits in said hole and rests on said lugs, said sub-unit being provided with one finger which projects under the edge of the hole and another finger which is spaced from the first and projects over the edge of each hole, said subunit being provided with a-heating winding.

5. A heating unit, comprising a plate having a hole, and a sub-unit which comprises a top plate and a bottom plate with a heating winding between them and releasable means for fastenin said two plates together and clamping the eating windingin place, said to plate being removably mounted in said be e flush with the top of said plate.

6. A heating uni comprising a plate having a hole, a suh-un1t wln comprises a top plate and a bottom plate with a heating winding between them and releasable means for fastening said two plates together and clamping the heating winding in place, said top plate fitting in said hole and bein provided with a finger which projectsun er the edge of said help and a finger spaced from the first and pro ecting hole, and means for fingers to said plate.

7. A heat unit comprising a plate with means for supporting it above an oven bottom, the said plate being provided with an opening, a sub-unit with metallic top and bottom plates disposed within the opening over the edge of saidastening one of said of the main plate, the metal top plate eK- tending beyond said bottom plate and an electric conductor disposed between the top 223 bottom platesof th e sub-unit, as speci- 

